session management in an enterprise comunication ... - Genband

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SESSION MANAGEMENT IN AN ENTERPRISE COMUNICATION NETWORK Table of Contents Session Management in an Enterprise Communication Network...................... 1 Introduction................................................................................................................. 3 Session Management Challenges................................................................................... 3 GENBAND Session Management Solution...................................................................... 4 GENiUS IMS VoLTE Solution.......................................................................................... 5 GENBAND Real Time Session Management (RSM)........................................................... 7 Summary.................................................................................................................... 10 2
SESSION MANAGEMENT IN AN ENTERPRISE COMUNICATION NETWORK Introduction Enterprise Chief Information Officers (CIOs) are increasingly aware that growing demand for information and collaboration at anytime, from anywhere is placing enormous burden on network infrastructure. What was once a secure voice network is now becoming a converged voice/data network supporting multiple IP interfaces and services. CIOs are pushed to their limits when confronted with questions such as: • How to support a multi-vendor network and guarantee interoperability • How to securely convert their existing public voice access from costly PRI trunks to inexpensive IP trunks • How to guarantee quality voice, video and multimedia services on a common IP infrastructure • How to introduce new SIP services into the network without affecting existing infrastructure • How to meet important E911 and CALEA requirements with the new VoIP network Enterprises need to harness the flexibility of the converged IP network to deliver voice and multimedia services but must do so without creating complex overlays for each specific service. Such convergence naturally brings to the forefront challenges of ensuring network security and service visibility. Clear demarcation of enterprise and service provider networks is mandatory to manage services across the demarcation and accounting for resource usage. The need for visibility into the behavior of the network, the user, and the performance of the services carried over a converged IP infrastructure supersedes traditional Time Division Multiplex (TDM) network management approaches. The emphasis becomes more on gaining visibility and control over the individual multimedia sessions that ride over the IP infrastructure. While IP networks provide many capabilities to define Virtual Private Networks (VPNs) and prioritize different multimedia traffic, they are not designed to be session-aware and they provide few capabilities to manage and control end-user sessions; a session being the IP-equivalent of a phone call. To illustrate this key point, many times users complain about call quality across a voice over IP (VoIP) enterprise network while the IP/MPLS network layer is working properly. This is a void in current IP network solutions and has the potential to impact converged IP-PBX installations. GENBAND’s session management solution complements enterprise routers, switches, IP PBXs and application servers, delivering the information and control necessary to guarantee quality sessions and services while customers realize both operational and capital expense savings. This paper discusses GENBAND’s unique approach to session management that enables enterprises to set up, secure, monitor, manage and account for IP-based sessions, both Session Initiated Protocol (SIP) and H.323. GENBAND’s solution enables network administrators to • Establish Public Switched Telephone Network (PSTN) like the granular control required for centralized session management, monitoring and accounting in a highly distributed converged IP network • Architect real-time dynamic policy based control of the end-to-end performance of each session • Flexibly meet enterprise service requirements without building separate overlay networks • Cost-effectively operate a converged communication network for the delivery of real-time IP services Session Management Challenges In the converged rich-media enterprise, service support requires traffic management on a session-by-session basis. Unlike the PSTN, which offers predictable resource utilization and guaranteed service levels, the IP network is inherently a multi-service and best-effort network. A new approach is required to derive PSTN-like controls and real-time service predictability. The IP-layer offers Quality of Service (QOS) and security features such as VLAN tagging and MPLS. However, even with these lower layer features, session quality is not guaranteed nor reported on an individual session basis; voice quality of a VoIP session may be poor while the IP layer is working properly. This problem is more apparent as IP sessions travel outside the enterprise via direct IP trunks to the service provider. While service providers may provide Service Level Agreements (SLA) within their own network, SLAs are difficult to guarantee as sessions traverse multiple and worldwide IP networks. Network administrators require added session specific control and intelligence that 3
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